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How to solve npm install throwing fsevents warning on non-MAC OS?

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What is FSEvents node?

Native access to MacOS FSEvents in Node.js. The FSEvents API in MacOS allows applications to register for notifications of changes to a given directory tree. It is a very fast and lightweight alternative to kqueue. This is a low-level library.

How does NPM CI work?

npm ci can only install entire projects at a time: individual dependencies cannot be added with this command. If a node_modules is already present, it will be automatically removed before npm ci begins its install. It will never write to package. json or any of the package-locks: installs are essentially frozen.


fsevents is dealt differently in mac and other linux system. Linux system ignores fsevents whereas mac install it. As the above error message states that fsevents is optional and it is skipped in installation process.

You can run npm install --no-optional command in linux system to avoid above warning.

Further information

https://github.com/npm/npm/issues/14185

https://github.com/npm/npm/issues/5095


If you want to hide this warn, you just need to install fsevents as a optional dependency. Just execute:

npm i fsevents@latest -f --save-optional

..And the warn will no longer be a bother.


npm i -f

I'd like to repost some comments from this thread, where you can read up on the issue and the issue was solved.

This is exactly Angular's issue. Current package.json requires fsevent as not optionalDependencies but devDependencies. This may be a problem for non-OSX users.

Sometimes

Even if you remove it from package.json npm i still fails because another module has it as a peer dep.

So

if npm-shrinkwrap.json is still there, please remove it or try npm i -f


package.json counts with a optionalDependencies key. NPM on Optional Dependencies.

You can add fsevents to this object and if you find yourself installing packages in a different platform than MacOS, fsevents will be skipped by either yarn or npm.

"optionalDependencies": {
  "fsevents": "2.1.2"
},

You will find a message like the following in the installation log:

info [email protected]: The platform "linux" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.
info [email protected]: The platform "linux" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.

Hope it helps!


I found the same problem and i tried all the solution mentioned above and in github. Some works only in local repository, when i push my PR in remote repositories with travic-CI or Pipelines give me the same error back. Finally i fixed it by using the npm command below.

npm audit fix --force